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A fat chance and a slim chance are the same thing
(lemmy.world)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
Think about filling in a form, though. Filling in a form—“to fill” is unambiguous. In/out isn’t even necessary when you think about it. “I’m going to fill a form” means the same thing too.
I feel like you're technically correct, but saying "fill a form" just sounds weird to a native English speaker.